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Toxicity to terrestrial arthropods

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Only one reliable (Klimisch 2) result is available for the effect of Na2SeO4 to reproduction of the terrestrial arthropod Folsomia candida, reporting a NOEC of 2.35 mg Se/kg soil (calculated as EC20/2, based on added Se concentration; Checkai et al., 2004). No results were available for the effect of selenite on terrestrial arthropods. Because of the significant difference in toxicity between selenite and selenate in the terrestrial ecosystem, data for selenate are not used for the hazard assessment of tetravalent inorganic Se substances, such as selenite.

Supporting information is available on the toxicity of various Se compounds to bees (Apis mellifera). The effects of organic ((methyl-)selenocysteine) and inorganic (selenite and selenate) selenium compounds in the diet (sucrose) on larval and forager stages were studied. EC50 values ranged from 0.72 to 161 mg Se/L. Organic selenium compounds were less toxic (> factor 3) then inorganic compounds, but differences selenite and selenate were limited. The most sensitive endpoint was found for the larval survival of Apis mellifera exposed to selenate (EC50 = 0.72 mg Se/L).